i bought a pistol a couple weeks ago. spent a bit of time at the range trying out different ammo. i had a few FTLs when using Winchester whitebox 115gr FMJ and Federal hi-shok 147 JHP. it seem that 124gr FMJ is the ideal ammo when using the factory ProMags. does anybody have recommendations for better magazines?

this gun is easily the most fun to shoot of anything in my collection. in fact, the only assault pistol that is as much fun is the SP89/MP5.

btw, after a week, i sent the pistol back to Bushmaster to have them check out the FTLs. i was SHOCKED when i got the pistol back only 6.5 days after i sent it to them.

I have used both the factory supplied magazines and the Colt SMG magazines. I have not had a failure ever with this gun but have only used the factory magazines 5 or 6 times. The Colt magazines work very well.